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Passive Athermalization: Maintaining Optical Performance Over Temperature

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An optical system is athermalized if its critical performance parameters (such as modulation transfer function, back focal length and effective focal length, etc.) do not change appreciably over the operating temperature range.

Janos Engineering, Janos Technology LLC

For rotationally symmetric optical systems, either the lens or the detector moves along the optical axis to maintain optical performance. If the compensating axial motion is accomplished without the use of motors or other active devices, then the optical system is considered passively athermalized. This article will discuss the consequences of uniform temperature fluctuations only and will ignore the impact of temperature gradients within the optical system. The coefficient of thermal expansion (CTE) and the thermal coefficient of refraction (TCR) are material properties of lenses and...Read full article

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